Use below query to get child key and foreign key status:

col owner form a10
col FK_column form a15
col table_name form a30
select b.owner, b.table_name child_table,b.status,
       c.column_name FK_column, b.constraint_name
  from dba_constraints a, dba_constraints b, dba_cons_columns c
where a.owner=b.r_owner
   and b.owner=c.owner
   and b.table_name=c.table_name
   and b.constraint_name=c.constraint_name
   and a.constraint_name=b.r_constraint_name
   and b.constraint_type='R'
   and a.owner='&OWNER'
   and a.table_name='&TABLE_NAME'
   and a.CONSTRAINT_TYPE='P';


OWNER      CHILD_TABLE                    STATUS   FK_COLUMN       CONSTRAINT_NAME
---------- ------------------------------ -------- --------------- ------------------------------
DDR        MDT_RM_DEVICE_TRAND            DISABLED DEV_TRAND_STATU MDT_RM_DACID_TRAND_STATUS_FK
                                                   S_ID

Enable constraints:

alter table FDR.MDT_RM_CALL_CLOSEOUT_METER disable constraints MDT_RM_CALL_CLOSEOUT_METER_FK;
 
Table altered.

Find the parent table of child table:

SELECT owner,
       table_name
FROM   dba_constraints
WHERE  constraint_name IN (SELECT r_constraint_name
                           FROM   dba_constraints WHERE
                            table_name = 'PUROLATOR_ACCOUNTS' AND  constraint_type = 'R');